
var $ = require('zepto');
var utils = require('utils');

$(function(){

    utils.adaptive();


    //运动事件监听
    if (window.DeviceMotionEvent) {
        window.addEventListener('devicemotion',shake,false);
    }else{
        alert("设备不支持运动事件监听");
    }

    //获取加速度信息
    //通过监听上一步获取到的x, y, z 值在一定时间范围内的变化率，进行设备是否有进行晃动的判断。
    //而为了防止正常移动的误判，需要给该变化率设置一个合适的临界值。
    var SHAKE_THRESHOLD = 10000;
    var last_update = 0;
    var x, y, z, last_x = 0, last_y = 0, last_z = 0;
    function shake(eventData) {
        var acceleration =eventData.accelerationIncludingGravity;
        var curTime = new Date().getTime();
        if ((curTime-last_update)> 100) {//监控时间

            var diffTime = curTime -last_update;
            last_update = curTime;
            x = acceleration.x;
            y = acceleration.y;
            z = acceleration.z;




            var speed = Math.abs(x +y + z - last_x - last_y - last_z) / diffTime * 10000;


            utils.prompt("x:"+x+"<br> y:"+y+"<br> z:"+z+"<br> spead:"+speed);

            if (speed > SHAKE_THRESHOLD) {
                alert("spead:"+speed);  // Do something
            }
            last_x = x;
            last_y = y;
            last_z = z;
        }
    }
});

